国产丝袜在线精品丝袜|在线A毛片免费视频观|日韩精品久久久一区二区|亚洲成在人网站天堂直播|99在线精品66视频无码|亚洲欧美不卡视频在线播放|国产精品久久久久久免费一级|久久精品国产亚洲AV香蕉软件

        1. <i id="avp7g"><ins id="avp7g"></ins></i>
          <td id="avp7g"><tr id="avp7g"></tr></td>
        2. <small id="avp7g"><dl id="avp7g"><small id="avp7g"></small></dl></small>
        3. <track id="avp7g"><dl id="avp7g"><delect id="avp7g"></delect></dl></track>

          <source id="avp7g"><ins id="avp7g"></ins></source>
        4. <p id="avp7g"><pre id="avp7g"></pre></p>
          <td id="avp7g"><tr id="avp7g"></tr></td>
        5. China Exclusive: China mines coal under railway tunnel

          Source: Xinhua| 2018-01-18 21:20:49|Editor: Zhou Xin
          Video PlayerClose

          TAIYUAN, Jan. 18 (Xinhua) -- A company in China's coal province of Shanxi has exploited coal under a railway tunnel using a new technology, the first project of its kind in the country.

          From January to September 2017, 736,000 tonnes of coal was successfully excavated from under a 2-km-long cargo railway tunnel for coal transport in Yangquan City.

          "The maximum land subsidence spot of the tunnel was only 81 mm after the exploitation, which did not affect train operations at all," Li Tao, a technical manager with the geological department of Yangquan coal industry group, told Xinhua Wednesday.

          The technology was co-developed by the group and China University of Mining and Technology, and the exploitation was conducted by Pingshang Coal Mine, an affiliated company of the group.

          "Via a hole drilled at the ground surface, concrete was filled into the cover rock, or the rock formation layer above the coal bed, to form a compacted platform to support the above weight so that the ground surface would not fall down during or after the mining," Li said. "We drilled seven holes and set up 43 monitor spots inside and outside the tunnel to monitor the ground sinking status, proving the technology works."

          The technology can also be used for coal mining under buildings and water.

          The group has around 2 billion tonnes of coal under buildings, water and railways, and the technology will help with exploitation.

          A coal field of another affiliated company of the group is home to the households of 70 villages, making coal exploitation hard in the region as the company cannot afford the relocation expenses, according to Wang.

          "Now that we have the technology, we are planning to excavate coal from under two villages this year, without relocating local residents," he said.

          Shanxi is a vital energy base. By the end of 2015, the province had 270.9 billion tonnes of known coal reserves, accounting for 17.3 percent of the country's total.

          TOP STORIES
          EDITOR’S CHOICE
          MOST VIEWED
          EXPLORE XINHUANET
          010020070750000000000000011100001369061081
          北京市| 太湖县| 普兰店市| 盱眙县| 浙江省| 永顺县| 札达县| 南宫市| 玛曲县| 贡嘎县| 和龙市| 洪江市| 闽侯县| 体育| 尉氏县| 水富县| 连平县| 新乡县| 余干县| 广丰县| 远安县| 宜良县| 皋兰县| 古田县| 无极县| 富裕县| 靖远县| 天等县| 塔河县| 渑池县| 育儿| 阜宁县| 景洪市| 板桥市| 洪洞县| 庆元县| 龙州县| 阜平县| 克拉玛依市| 宝兴县| 玛沁县|